if I order a product with a quantity of 3, I get a command line. If I decide to order the same product, with a quantity of 2, I get a second control line.
I will wish to obtain a single command line for this product, with an amount of 5.
Can you help me?
I use joomla 2.5.6 and virtuemart 2
Do you have a site we can look at?
Perhaps also turn on the VM and JOOMLA debugger. That'll give you more insight into what your application is doing.